Method of producing surfaces of comminuted material



Feb. 4, 1936. A. DILLER ET AL METHOD OF PRODUCING SURFACES OF C OMMINUTED MATERIAL Filed June 8. 1934 2 Sheets-Sheet l Jul-7 Law/ E .Zsasfis EL 270/5511? Feb. H A. L. DILLER ET AL 2,029,361

METHOD OF PRODUCING SURFACES OF COMMINUTED MATERIAL Filed June 8, 1954 2 Sheets-Sheet 2 .Zes /iE ELY 215M54 7 z'. a iffys.

Patented Feb. 4, 1936 UNITED STATES PATENT OFFICE METHOD OF PRODUCING SURFACES F GOMMINUTED MATERIAL Alvin L. Diller, Belmont, and Leslie H. LHollier, Waltham, Mass.,. assignors to Hood Rubber Company, Inc., Watertown, Mass., a corporation of Delaware Application June 8, 1934, Serial No. 729,724

4 Claims. (01. 18-58) This invention relates to the production of spraying the liquid upon the surface. Upon this surfaces of comminuted material, especially conis deposited, as by blowing, a layer I3 of flock or toured rubber articles, such as rubber footwear, other comminuted material, which adheres only having surfaces of flock or other comminuted to the area of the form which has the liquid upon material. it. A thin layer I4 of liquid dispersed rubber, 5

The chief objects of the invention are to propreferably a solvent dispersed rubber, is then vide improved procedure for conveniently producapplied to hold the flock without disturbing it, ing surfaces of comminuted material, to provide and then a further layer of rubber I5 is deposited for producing configured surfaces of comminuted thereupon in molded relation to it to provide material, and to provide for conveniently prothe body of the article- 10 ducing contoured rubber articles in which both Preferably the adhesive liquid comprises a the faces of comminuted material and the face coagulant of rubber and the outer layer I5 is opposite are neatly formed. deposited from an aqueous dispersion of the These and further objects will be apparent from rubber. It has been found that in such case the the following description, reference being had to rubber of the layer l5 becomes coagulated ap- 15 the accompanying drawings, in which: parently by migration of the coagulant through Fig. 1 is an elevation, with parts broken away, the layers l3 and i l to the layer I 5.v of a matrix form having a rubber. shoe formed A liquid for this purpose which has given good thereon in accordance with the preferred prore u ts C p by Weig t, about y cedure of the invention. erine, about 22% coagulant for rubber, such as 20 Fig. 2 is an enlarged section, with parts broken calcium nitrate or zinc chloride, and the remainaway, taken along the line 22 of Fig. 1. der a volatile liquid such as acetone, alcohol, or

Fig. 3 is an elevation of the matrix form of both. This example is illustrative merely, and Fig.1with the rubber shoe partly stripped from it. is not wholly limiting, as various other sub- 25 Fig. 4 is an elevation, with parts broken away stances may in many cases be used to provide 25 and sectioned, of a form having a shoe body dea temporary and weak adhesive for the composited thereon in accordance with a modified minuted material. procedure of the invention. The layered structure of the shoe is then re- Fig. 5 is a section on an enlarged scale, with moved from the form as shown in Fig. 3, and parts broken away, taken along the line 55 of preferably is mounted inside out upon a shaping 30 Fig. 4. support and vulcanized in open heat. If any resi- Figs. 6 and? are elevations of the form of Fig. 4 due to the substance I3 remains on the flocked with a shoe body mounted upon it in accordance surface it may be removed, as by washing or with successive steps of the modified procedure. brushing. As shown in Fig. 3 the surface of com- Fig. 8 is an elevation of the completed shoe minuted material, as well as the rubber surface, 35 made by the modified procedure. has formed in it a positive reproduction of the In Fig. 1 a matrix shoe form is provided comsurface design of the matrix. prising a support I0 having mounted upon it a In case it is desired to produce a shoe with a matrix material ll, preferably rubber, having flock lining and a smooth rubber outer surface,

molded or otherwise formed in its outer surface a the procedure above described may be followed, 40 negative reproduction of a chosen configured a smooth form being used, however, rather than design, for example that of the surface of a reptile the matrix form described above, and the article skin. being vulcanized on that form without being The invention makes possible the production turned inside out, so that the flocked face will reof a rubber shoe having a surface of it molded main on the inside of the shoe and the smooth 45 to the surface design of the matrix and at the rubber face will remain at the outside. same time the provision of a layer of flock or For this type of flocked shoe the modified proother comminuted material upon the whole or cedure of Figs. 4 to 8 also is well adapted.

' portions only of the designed surface with the The modified procedure makes possible the configuration appearing in such surface. production of a shoe with one face of flock and 50 To this end a thin layer or film l2 of a subthe opposite face of rubber with both faces unstance suitable as a temporary adhesive for flock, molded although the shoe is formed by deposipreferably in liquid form, is deposited upon the tion upon a form. This is of advantage especialmatrix surface over the area or areas desired to ly in cases where it is desired not to rely upon be flocked. This may be done by painting or the form surface for providing the smooth sur- 55 have been'formed inthe surface of layer 2i, resulting from the deposition of the rubber of this layer directly upon the form surface, are hidden :inthe wall of the final article, of which both liquid dispersion of the rubber. also be added, and

face as it is sometimes diflicult to prevent scratching or otherwise marring the form surface in use.

In this modified procedure a layer 2| of rubber is deposited upon a form 20 by any suitable procedure, preferably by deposition from an aqueous dispersion of the rubber withtheaid of a coagulating agent. Upon this is deposited a layer 22 of rubber cement or other substance suitable to adhere comminuted material permanently and upon this is applied a layer 23 of flock or other comminuted material. V g

After the rubber layers have at least partially dried the layered structure is stripped from the form, as shown in Fig. 6, and is mounted inside out upon the same or another similar form, as shown in Fig. 7

Heel and toe reinforcements 24 and. 25may now be adhered to the surface of the layer 2|, and an outer layer 26 (Fig. 8) of rubber superimposed upon it preferably by'depositing from a A sole 2! may the shoe may then be vulcanized.

. By this procedure any imperfections that may the inner flocked surface and the outer rubber surface may be provided neat and smooth.

Variations may be made without departing from the scope of the invention as it is defined in the following claims. 7

We claim: 7 1. The method of making a rubber article having a surface of comminuted material which which comprises depositing upon a configured supporting surface a thin layer of substance adapted to coagulate a dispersion of rubber and temporarily to retain comminuted material, depositing thereupon a layer of comminuted material, depositing upon the latter in adhesion therewith alayer of. rubber, and removing the layered structure to present. its configured surface of comminuted material as a face of the article.

3. The. method of making a contoured rubber article having a configured surface of comminuted material which comprises depositing upon a configured form a thin layer s of substance adapted temporarily to retain comminuted matea j rial, depositing thereupon a layer ofcomminuted material, depositing upon the latter in adhesion therewith a layer of rubber, removing the layered structure and mounting it inside out upon a shaping support topresent its configured surface of comminuted material as an outer face of the article, and vulcanizing the article.

4. A method as defined in claim 3 in which the thin layer ofsaid substance is an adhesive liquid comprising a coagulant for rubber, and at least a portion of the rubber applied upon the comminuted material is coagulable.

ALVIN L. DILLER. LESLIE LI-IOLLIER. 

